EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title "Logic level serial to RS485"
Date "2020-07-31"
Rev "1.0"
Comp "Copyright (c) 2020 Michael Buesch <m@bues.ch>"
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Interface_UART:MAX485E U3
U 1 1 5CB8D683
P 6200 2000
F 0 "U3" H 5950 2500 50  0000 C CNN
F 1 "MAX485E" H 6450 2500 50  0000 C CNN
F 2 "" H 6200 1300 50  0001 C CNN
F 3 "https://datasheets.maximintegrated.com/en/ds/MAX1487E-MAX491E.pdf" H 6200 2050 50  0001 C CNN
	1    6200 2000
	1    0    0    -1  
$EndComp
Wire Wire Line
	5800 2000 5750 2000
Wire Wire Line
	5750 2000 5750 2100
Wire Wire Line
	5750 2100 5800 2100
$Comp
L Device:R R2
U 1 1 5CB94CFF
P 4250 1900
F 0 "R2" V 4043 1900 50  0000 C CNN
F 1 "1k" V 4134 1900 50  0000 C CNN
F 2 "" V 4180 1900 50  0001 C CNN
F 3 "~" H 4250 1900 50  0001 C CNN
	1    4250 1900
	0    1    1    0   
$EndComp
$Comp
L Device:D_Zener ZD1
U 1 1 5CB95601
P 4000 1500
F 0 "ZD1" V 4046 1421 50  0000 R CNN
F 1 "3.3V" V 3955 1421 50  0000 R CNN
F 2 "" H 4000 1500 50  0001 C CNN
F 3 "~" H 4000 1500 50  0001 C CNN
	1    4000 1500
	0    -1   -1   0   
$EndComp
Wire Wire Line
	5800 1900 5500 1900
Wire Wire Line
	4100 1900 4000 1900
Wire Wire Line
	4000 1650 4000 1900
Connection ~ 4000 1900
$Comp
L Device:R R4
U 1 1 5CB9841F
P 5500 1400
F 0 "R4" H 5570 1446 50  0000 L CNN
F 1 "10k" H 5570 1355 50  0000 L CNN
F 2 "" V 5430 1400 50  0001 C CNN
F 3 "~" H 5500 1400 50  0001 C CNN
	1    5500 1400
	1    0    0    -1  
$EndComp
Wire Wire Line
	5500 1550 5500 1900
Connection ~ 5500 1900
Wire Wire Line
	5500 1900 4400 1900
$Comp
L power:+5V #PWR012
U 1 1 5CB98ED3
P 5500 1050
F 0 "#PWR012" H 5500 900 50  0001 C CNN
F 1 "+5V" H 5515 1223 50  0000 C CNN
F 2 "" H 5500 1050 50  0001 C CNN
F 3 "" H 5500 1050 50  0001 C CNN
	1    5500 1050
	1    0    0    -1  
$EndComp
Wire Wire Line
	5500 1050 5500 1250
$Comp
L power:GND #PWR06
U 1 1 5CB996CA
P 2600 1700
F 0 "#PWR06" H 2600 1450 50  0001 C CNN
F 1 "GND" V 2605 1572 50  0000 R CNN
F 2 "" H 2600 1700 50  0001 C CNN
F 3 "" H 2600 1700 50  0001 C CNN
	1    2600 1700
	0    -1   -1   0   
$EndComp
$Comp
L power:+5V #PWR07
U 1 1 5CB99CD2
P 2600 1800
F 0 "#PWR07" H 2600 1650 50  0001 C CNN
F 1 "+5V" V 2615 1928 50  0000 L CNN
F 2 "" H 2600 1800 50  0001 C CNN
F 3 "" H 2600 1800 50  0001 C CNN
	1    2600 1800
	0    1    1    0   
$EndComp
Wire Wire Line
	1800 1700 2600 1700
Wire Wire Line
	1800 1800 2600 1800
Wire Wire Line
	3050 2000 3050 2200
Text Label 1950 1700 0    50   ~ 0
GND
Text Label 1950 1800 0    50   ~ 0
+5V
Text Label 1950 1900 0    50   ~ 0
<-RXD
Text Label 1950 2000 0    50   ~ 0
->TXD
$Comp
L power:+5V #PWR013
U 1 1 5CBA0963
P 6200 1050
F 0 "#PWR013" H 6200 900 50  0001 C CNN
F 1 "+5V" H 6215 1223 50  0000 C CNN
F 2 "" H 6200 1050 50  0001 C CNN
F 3 "" H 6200 1050 50  0001 C CNN
	1    6200 1050
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR014
U 1 1 5CBA0E2E
P 6200 2700
F 0 "#PWR014" H 6200 2450 50  0001 C CNN
F 1 "GND" H 6205 2527 50  0000 C CNN
F 2 "" H 6200 2700 50  0001 C CNN
F 3 "" H 6200 2700 50  0001 C CNN
	1    6200 2700
	1    0    0    -1  
$EndComp
Wire Wire Line
	6200 2600 6200 2700
$Comp
L power:GND #PWR010
U 1 1 5CBA1C43
P 4000 1050
F 0 "#PWR010" H 4000 800 50  0001 C CNN
F 1 "GND" H 4005 877 50  0000 C CNN
F 2 "" H 4000 1050 50  0001 C CNN
F 3 "" H 4000 1050 50  0001 C CNN
	1    4000 1050
	-1   0    0    1   
$EndComp
Wire Wire Line
	4000 1050 4000 1350
$Comp
L Device:C C4
U 1 1 5CBA292A
P 6500 1250
F 0 "C4" V 6248 1250 50  0000 C CNN
F 1 "100n" V 6339 1250 50  0000 C CNN
F 2 "" H 6538 1100 50  0001 C CNN
F 3 "~" H 6500 1250 50  0001 C CNN
	1    6500 1250
	0    1    1    0   
$EndComp
Wire Wire Line
	6350 1250 6200 1250
Connection ~ 6200 1250
Wire Wire Line
	6200 1250 6200 1500
$Comp
L power:GND #PWR015
U 1 1 5CBA38AE
P 6750 1250
F 0 "#PWR015" H 6750 1000 50  0001 C CNN
F 1 "GND" V 6755 1122 50  0000 R CNN
F 2 "" H 6750 1250 50  0001 C CNN
F 3 "" H 6750 1250 50  0001 C CNN
	1    6750 1250
	0    -1   -1   0   
$EndComp
Wire Wire Line
	6650 1250 6750 1250
$Comp
L Device:CP C6
U 1 1 5CBA4F13
P 10100 4650
F 0 "C6" H 10218 4696 50  0000 L CNN
F 1 "10µ/16V" H 10218 4605 50  0000 L CNN
F 2 "" H 10138 4500 50  0001 C CNN
F 3 "~" H 10100 4650 50  0001 C CNN
	1    10100 4650
	1    0    0    -1  
$EndComp
$Comp
L Connector:DB9_Female J2
U 1 1 5CBAC88B
P 10250 1800
F 0 "J2" H 10430 1846 50  0000 L CNN
F 1 "DB9_Female" H 10430 1755 50  0000 L CNN
F 2 "" H 10250 1800 50  0001 C CNN
F 3 " ~" H 10250 1800 50  0001 C CNN
	1    10250 1800
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR024
U 1 1 5CBB4A1B
P 9850 2200
F 0 "#PWR024" H 9850 1950 50  0001 C CNN
F 1 "GND" V 9855 2072 50  0000 R CNN
F 2 "" H 9850 2200 50  0001 C CNN
F 3 "" H 9850 2200 50  0001 C CNN
	1    9850 2200
	0    1    1    0   
$EndComp
Wire Wire Line
	9850 2200 9950 2200
$Comp
L power:+5V #PWR023
U 1 1 5CBB59FE
P 9850 1500
F 0 "#PWR023" H 9850 1350 50  0001 C CNN
F 1 "+5V" V 9865 1628 50  0000 L CNN
F 2 "" H 9850 1500 50  0001 C CNN
F 3 "" H 9850 1500 50  0001 C CNN
	1    9850 1500
	0    -1   -1   0   
$EndComp
Wire Wire Line
	9850 1500 9950 1500
Wire Wire Line
	9350 1800 9350 2200
Wire Wire Line
	9350 1800 9950 1800
Wire Wire Line
	1800 2000 3050 2000
$Comp
L Timer:NE555P U1
U 1 1 5F208B43
P 2350 6200
F 0 "U1" H 2050 6600 50  0000 C CNN
F 1 "NE555" H 2600 6600 50  0000 C CNN
F 2 "Package_DIP:DIP-8_W7.62mm" H 3000 5800 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ne555.pdf" H 3200 5800 50  0001 C CNN
	1    2350 6200
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR04
U 1 1 5F20AD35
P 2350 5500
F 0 "#PWR04" H 2350 5350 50  0001 C CNN
F 1 "+5V" H 2365 5673 50  0000 C CNN
F 2 "" H 2350 5500 50  0001 C CNN
F 3 "" H 2350 5500 50  0001 C CNN
	1    2350 5500
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR05
U 1 1 5F20BFE3
P 2350 6800
F 0 "#PWR05" H 2350 6550 50  0001 C CNN
F 1 "GND" H 2355 6627 50  0000 C CNN
F 2 "" H 2350 6800 50  0001 C CNN
F 3 "" H 2350 6800 50  0001 C CNN
	1    2350 6800
	1    0    0    -1  
$EndComp
Wire Wire Line
	2350 5500 2350 5600
Wire Wire Line
	2350 6600 2350 6800
$Comp
L power:+5V #PWR03
U 1 1 5F20DD5F
P 1700 6400
F 0 "#PWR03" H 1700 6250 50  0001 C CNN
F 1 "+5V" H 1715 6573 50  0000 C CNN
F 2 "" H 1700 6400 50  0001 C CNN
F 3 "" H 1700 6400 50  0001 C CNN
	1    1700 6400
	0    -1   -1   0   
$EndComp
Wire Wire Line
	1700 6400 1850 6400
$Comp
L Device:C C3
U 1 1 5F20EFE0
P 3400 6600
F 0 "C3" H 3515 6646 50  0000 L CNN
F 1 "10n" H 3515 6555 50  0000 L CNN
F 2 "" H 3438 6450 50  0001 C CNN
F 3 "~" H 3400 6600 50  0001 C CNN
	1    3400 6600
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR09
U 1 1 5F20FA74
P 3400 6800
F 0 "#PWR09" H 3400 6550 50  0001 C CNN
F 1 "GND" H 3405 6627 50  0000 C CNN
F 2 "" H 3400 6800 50  0001 C CNN
F 3 "" H 3400 6800 50  0001 C CNN
	1    3400 6800
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 6750 3400 6800
Wire Wire Line
	2850 6200 3400 6200
Wire Wire Line
	3400 6200 3400 6400
Wire Wire Line
	2850 6400 3400 6400
Connection ~ 3400 6400
Wire Wire Line
	3400 6400 3400 6450
$Comp
L Device:D D1
U 1 1 5F212E6D
P 3700 6200
F 0 "D1" H 3700 5983 50  0000 C CNN
F 1 "1N4148" H 3700 6074 50  0000 C CNN
F 2 "" H 3700 6200 50  0001 C CNN
F 3 "~" H 3700 6200 50  0001 C CNN
	1    3700 6200
	-1   0    0    1   
$EndComp
Wire Wire Line
	3400 6200 3550 6200
Connection ~ 3400 6200
Wire Wire Line
	3850 6200 4050 6200
Wire Wire Line
	4050 6200 4050 7050
Wire Wire Line
	4050 7050 1200 7050
Wire Wire Line
	1200 7050 1200 6000
Wire Wire Line
	1200 6000 1850 6000
$Comp
L Device:C C2
U 1 1 5F216AEB
P 1650 6200
F 0 "C2" V 1398 6200 50  0000 C CNN
F 1 "100n" V 1489 6200 50  0000 C CNN
F 2 "" H 1688 6050 50  0001 C CNN
F 3 "~" H 1650 6200 50  0001 C CNN
	1    1650 6200
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR02
U 1 1 5F21A30C
P 1450 6200
F 0 "#PWR02" H 1450 5950 50  0001 C CNN
F 1 "GND" H 1455 6027 50  0000 C CNN
F 2 "" H 1450 6200 50  0001 C CNN
F 3 "" H 1450 6200 50  0001 C CNN
	1    1450 6200
	0    1    1    0   
$EndComp
Wire Wire Line
	1450 6200 1500 6200
Wire Wire Line
	1800 6200 1850 6200
Connection ~ 5750 2200
Wire Wire Line
	5750 2200 5800 2200
Wire Wire Line
	5750 2200 5750 6200
$Comp
L power:+5V #PWR08
U 1 1 5F2D08C9
P 3400 5200
F 0 "#PWR08" H 3400 5050 50  0001 C CNN
F 1 "+5V" H 3415 5373 50  0000 C CNN
F 2 "" H 3400 5200 50  0001 C CNN
F 3 "" H 3400 5200 50  0001 C CNN
	1    3400 5200
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 5200 3400 5300
$Comp
L Device:C C1
U 1 1 5F2DD0AB
P 1650 5600
F 0 "C1" V 1398 5600 50  0000 C CNN
F 1 "100n" V 1489 5600 50  0000 C CNN
F 2 "" H 1688 5450 50  0001 C CNN
F 3 "~" H 1650 5600 50  0001 C CNN
	1    1650 5600
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR01
U 1 1 5F2DD6EA
P 1450 5600
F 0 "#PWR01" H 1450 5350 50  0001 C CNN
F 1 "GND" H 1455 5427 50  0000 C CNN
F 2 "" H 1450 5600 50  0001 C CNN
F 3 "" H 1450 5600 50  0001 C CNN
	1    1450 5600
	0    1    1    0   
$EndComp
Wire Wire Line
	1450 5600 1500 5600
Wire Wire Line
	1800 5600 2350 5600
Connection ~ 2350 5600
Wire Wire Line
	2350 5600 2350 5800
NoConn ~ 9950 1400
NoConn ~ 9950 1600
NoConn ~ 9950 1700
NoConn ~ 9950 2000
NoConn ~ 9950 2100
Wire Wire Line
	10100 4800 10100 5300
$Comp
L Connector:Conn_01x05_Male J1
U 1 1 5F35710C
P 1600 1900
F 0 "J1" H 1708 2281 50  0000 C CNN
F 1 "serial" H 1708 2190 50  0000 C CNN
F 2 "" H 1600 1900 50  0001 C CNN
F 3 "~" H 1600 1900 50  0001 C CNN
	1    1600 1900
	1    0    0    -1  
$EndComp
$Comp
L Jumper:Jumper_3_Bridged12 JP1
U 1 1 5F35E621
P 2950 4550
F 0 "JP1" V 3100 4650 50  0000 L CNN
F 1 "TXDen" V 3000 4600 50  0000 L CNN
F 2 "" H 2950 4550 50  0001 C CNN
F 3 "~" H 2950 4550 50  0001 C CNN
	1    2950 4550
	0    -1   -1   0   
$EndComp
Wire Wire Line
	2950 2100 1800 2100
Wire Wire Line
	2950 4800 2950 6000
Wire Wire Line
	2950 6000 2850 6000
Text Label 1950 2100 0    50   ~ 0
->TXDen
$Comp
L Device:D D3
U 1 1 5F3DFD1F
P 4800 5150
F 0 "D3" V 4754 5230 50  0000 L CNN
F 1 "1N4148" V 4845 5230 50  0000 L CNN
F 2 "" H 4800 5150 50  0001 C CNN
F 3 "~" H 4800 5150 50  0001 C CNN
	1    4800 5150
	0    1    1    0   
$EndComp
$Comp
L Device:D D2
U 1 1 5F3F8197
P 4400 4550
F 0 "D2" H 4400 4333 50  0000 C CNN
F 1 "1N4148" H 4400 4424 50  0000 C CNN
F 2 "" H 4400 4550 50  0001 C CNN
F 3 "~" H 4400 4550 50  0001 C CNN
	1    4400 4550
	-1   0    0    1   
$EndComp
$Comp
L Device:Jumper_NC_Small JP2
U 1 1 5F3FFF29
P 4800 4800
F 0 "JP2" V 4846 4753 50  0000 R CNN
F 1 "TXDenF" V 4755 4753 50  0000 R CNN
F 2 "" H 4800 4800 50  0001 C CNN
F 3 "~" H 4800 4800 50  0001 C CNN
	1    4800 4800
	0    -1   -1   0   
$EndComp
Wire Wire Line
	2950 2100 2950 4300
$Comp
L Device:R_POT RV1
U 1 1 5F42B185
P 3400 5450
F 0 "RV1" H 3330 5496 50  0000 R CNN
F 1 "50k" H 3330 5405 50  0000 R CNN
F 2 "" H 3400 5450 50  0001 C CNN
F 3 "~" H 3400 5450 50  0001 C CNN
	1    3400 5450
	1    0    0    -1  
$EndComp
Wire Wire Line
	3550 5450 3550 5300
Wire Wire Line
	3550 5300 3400 5300
Connection ~ 3400 5300
$Comp
L Device:R R3
U 1 1 5F439704
P 5150 4550
F 0 "R3" V 4943 4550 50  0000 C CNN
F 1 "10k" V 5034 4550 50  0000 C CNN
F 2 "" V 5080 4550 50  0001 C CNN
F 3 "~" H 5150 4550 50  0001 C CNN
	1    5150 4550
	0    1    1    0   
$EndComp
$Comp
L 74xx:74HC04 U2
U 1 1 5F456267
P 5150 6200
F 0 "U2" H 5150 5883 50  0000 C CNN
F 1 "74HC04" H 5150 5974 50  0000 C CNN
F 2 "" H 5150 6200 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 5150 6200 50  0001 C CNN
	1    5150 6200
	-1   0    0    1   
$EndComp
$Comp
L 74xx:74HC04 U2
U 2 1 5F23E82B
P 4450 6200
F 0 "U2" H 4450 5883 50  0000 C CNN
F 1 "74HC04" H 4450 5974 50  0000 C CNN
F 2 "" H 4450 6200 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 4450 6200 50  0001 C CNN
	2    4450 6200
	-1   0    0    1   
$EndComp
Wire Wire Line
	4850 6200 4800 6200
Wire Wire Line
	4150 6200 4050 6200
Connection ~ 4050 6200
Wire Wire Line
	5450 6200 5750 6200
Wire Wire Line
	4800 5300 4800 6200
Connection ~ 4800 6200
Wire Wire Line
	4800 6200 4750 6200
Wire Wire Line
	4800 5000 4800 4900
Wire Wire Line
	4250 4550 3100 4550
Wire Wire Line
	4550 4550 4800 4550
Wire Wire Line
	4800 4700 4800 4550
Connection ~ 4800 4550
Wire Wire Line
	5000 4550 4800 4550
$Comp
L power:GND #PWR011
U 1 1 5F27D977
P 5350 4550
F 0 "#PWR011" H 5350 4300 50  0001 C CNN
F 1 "GND" H 5355 4377 50  0000 C CNN
F 2 "" H 5350 4550 50  0001 C CNN
F 3 "" H 5350 4550 50  0001 C CNN
	1    5350 4550
	0    -1   -1   0   
$EndComp
Wire Wire Line
	5300 4550 5350 4550
$Comp
L 74xx:74HC04 U2
U 4 1 5F29FB37
P 4800 3350
F 0 "U2" H 4800 3033 50  0000 C CNN
F 1 "74HC04" H 4800 3124 50  0000 C CNN
F 2 "" H 4800 3350 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 4800 3350 50  0001 C CNN
	4    4800 3350
	0    -1   -1   0   
$EndComp
$Comp
L 74xx:74HC04 U2
U 3 1 5F2A43AE
P 4800 4000
F 0 "U2" H 4800 3683 50  0000 C CNN
F 1 "74HC04" H 4800 3774 50  0000 C CNN
F 2 "" H 4800 4000 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 4800 4000 50  0001 C CNN
	3    4800 4000
	0    -1   -1   0   
$EndComp
Wire Wire Line
	4800 3650 4800 3700
Wire Wire Line
	4800 4300 4800 4550
Wire Wire Line
	4800 3050 4800 2450
$Comp
L 74xx:74HC04 U2
U 7 1 5F35960F
P 8050 5150
F 0 "U2" H 7850 5500 50  0000 C CNN
F 1 "74HC04" H 8050 5150 50  0000 C CNN
F 2 "" H 8050 5150 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 8050 5150 50  0001 C CNN
	7    8050 5150
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR020
U 1 1 5F368B46
P 8050 4400
F 0 "#PWR020" H 8050 4250 50  0001 C CNN
F 1 "+5V" H 8065 4573 50  0000 C CNN
F 2 "" H 8050 4400 50  0001 C CNN
F 3 "" H 8050 4400 50  0001 C CNN
	1    8050 4400
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR021
U 1 1 5F369165
P 8050 5750
F 0 "#PWR021" H 8050 5500 50  0001 C CNN
F 1 "GND" H 8055 5577 50  0000 C CNN
F 2 "" H 8050 5750 50  0001 C CNN
F 3 "" H 8050 5750 50  0001 C CNN
	1    8050 5750
	1    0    0    -1  
$EndComp
Wire Wire Line
	8050 5650 8050 5750
$Comp
L Device:C C5
U 1 1 5F36E655
P 8300 4550
F 0 "C5" V 8048 4550 50  0000 C CNN
F 1 "100n" V 8139 4550 50  0000 C CNN
F 2 "" H 8338 4400 50  0001 C CNN
F 3 "~" H 8300 4550 50  0001 C CNN
	1    8300 4550
	0    1    1    0   
$EndComp
Wire Wire Line
	8050 4650 8050 4550
Wire Wire Line
	8150 4550 8050 4550
Connection ~ 8050 4550
Wire Wire Line
	8050 4550 8050 4400
$Comp
L power:GND #PWR022
U 1 1 5F37E4C5
P 8500 4550
F 0 "#PWR022" H 8500 4300 50  0001 C CNN
F 1 "GND" H 8505 4377 50  0000 C CNN
F 2 "" H 8500 4550 50  0001 C CNN
F 3 "" H 8500 4550 50  0001 C CNN
	1    8500 4550
	0    -1   -1   0   
$EndComp
Wire Wire Line
	8450 4550 8500 4550
Wire Wire Line
	6200 1050 6200 1250
$Comp
L power:+5V #PWR025
U 1 1 5F3F5136
P 10100 3950
F 0 "#PWR025" H 10100 3800 50  0001 C CNN
F 1 "+5V" H 10115 4123 50  0000 C CNN
F 2 "" H 10100 3950 50  0001 C CNN
F 3 "" H 10100 3950 50  0001 C CNN
	1    10100 3950
	1    0    0    -1  
$EndComp
Wire Wire Line
	10100 3950 10100 4500
$Comp
L power:GND #PWR026
U 1 1 5F403F05
P 10100 5300
F 0 "#PWR026" H 10100 5050 50  0001 C CNN
F 1 "GND" H 10105 5127 50  0000 C CNN
F 2 "" H 10100 5300 50  0001 C CNN
F 3 "" H 10100 5300 50  0001 C CNN
	1    10100 5300
	1    0    0    -1  
$EndComp
Text Notes 10100 1100 0    50   ~ 0
RS485\nPROFIBUS
Text Notes 1350 1100 0    50   ~ 0
Serial (LV)TTL\n5V power supply\n3.3V signals (RxD, TxD, TxDen)
Text Notes 3100 4450 0    50   ~ 0
2-3: TxDen from\nexternal pin
Text Notes 3100 4850 0    50   ~ 0
1-2: TxDen from\ninternal timer
Text Notes 3600 5550 0    50   ~ 0
TxDen\ntimeout
Text Notes 4400 4950 0    50   ~ 0
closed:\nTxDen\nfast start
Wire Wire Line
	3050 2200 5750 2200
Wire Wire Line
	1800 1900 4000 1900
$Comp
L Device:R R1
U 1 1 5F4C631B
P 3400 5800
F 0 "R1" H 3470 5846 50  0000 L CNN
F 1 "220" H 3470 5755 50  0000 L CNN
F 2 "" V 3330 5800 50  0001 C CNN
F 3 "~" H 3400 5800 50  0001 C CNN
	1    3400 5800
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 5600 3400 5650
Wire Wire Line
	3400 5950 3400 6200
$Comp
L Device:R R5
U 1 1 5F2557D9
P 7800 1150
F 0 "R5" V 7593 1150 50  0000 C CNN
F 1 "390" V 7684 1150 50  0000 C CNN
F 2 "" V 7730 1150 50  0001 C CNN
F 3 "~" H 7800 1150 50  0001 C CNN
	1    7800 1150
	0    1    1    0   
$EndComp
$Comp
L Device:R R6
U 1 1 5F255B99
P 8200 1150
F 0 "R6" V 7993 1150 50  0000 C CNN
F 1 "220" V 8084 1150 50  0000 C CNN
F 2 "" V 8130 1150 50  0001 C CNN
F 3 "~" H 8200 1150 50  0001 C CNN
	1    8200 1150
	0    1    1    0   
$EndComp
$Comp
L Device:R R7
U 1 1 5F2561C4
P 8600 1150
F 0 "R7" V 8393 1150 50  0000 C CNN
F 1 "390" V 8484 1150 50  0000 C CNN
F 2 "" V 8530 1150 50  0001 C CNN
F 3 "~" H 8600 1150 50  0001 C CNN
	1    8600 1150
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR019
U 1 1 5F256A12
P 8850 1150
F 0 "#PWR019" H 8850 900 50  0001 C CNN
F 1 "GND" V 8855 1022 50  0000 R CNN
F 2 "" H 8850 1150 50  0001 C CNN
F 3 "" H 8850 1150 50  0001 C CNN
	1    8850 1150
	0    -1   -1   0   
$EndComp
$Comp
L power:+5V #PWR016
U 1 1 5F257E11
P 7550 1150
F 0 "#PWR016" H 7550 1000 50  0001 C CNN
F 1 "+5V" H 7565 1323 50  0000 C CNN
F 2 "" H 7550 1150 50  0001 C CNN
F 3 "" H 7550 1150 50  0001 C CNN
	1    7550 1150
	0    -1   -1   0   
$EndComp
$Comp
L Switch:SW_DPST SW1
U 1 1 5F26E5D5
P 8200 1500
F 0 "SW1" V 8246 1312 50  0000 R CNN
F 1 "term_en" V 8155 1312 50  0000 R CNN
F 2 "" H 8200 1500 50  0001 C CNN
F 3 "~" H 8200 1500 50  0001 C CNN
	1    8200 1500
	0    -1   -1   0   
$EndComp
Text Label 9400 1900 0    39   ~ 0
NEG(PB-A)
Text Label 9400 1800 0    39   ~ 0
POS(PB-B)
Wire Wire Line
	7550 1150 7650 1150
Wire Wire Line
	7950 1150 8000 1150
Wire Wire Line
	8350 1150 8400 1150
Wire Wire Line
	8750 1150 8850 1150
Wire Wire Line
	8100 1300 8000 1300
Wire Wire Line
	8000 1300 8000 1150
Connection ~ 8000 1150
Wire Wire Line
	8000 1150 8050 1150
Wire Wire Line
	8300 1300 8400 1300
Wire Wire Line
	8400 1300 8400 1150
Connection ~ 8400 1150
Wire Wire Line
	8400 1150 8450 1150
Wire Wire Line
	6600 2200 8100 2200
Wire Wire Line
	6600 1900 8300 1900
Wire Wire Line
	8300 1700 8300 1900
Connection ~ 8300 1900
Wire Wire Line
	8100 1700 8100 2200
Connection ~ 8100 2200
Text Label 6650 2200 0    39   ~ 0
POS(PB-B)
Text Label 6650 1900 0    39   ~ 0
NEG(PB-A)
Wire Wire Line
	8300 1900 9950 1900
Wire Wire Line
	8100 2200 9350 2200
Wire Notes Line
	9250 650  9250 2450
Wire Notes Line
	9250 2450 7200 2450
Wire Notes Line
	7200 2450 7200 650 
Wire Notes Line
	7200 650  9250 650 
Text Notes 7250 750  0    50   ~ 0
Optional Profibus termination
Wire Notes Line
	6550 7450 850  7450
Wire Notes Line
	850  7450 800  3000
Text Notes 900  3150 0    50   ~ 0
Optional TxDen-timer
$Comp
L 74xx:74HC04 U2
U 5 1 5F3477D8
P 6950 5200
F 0 "U2" H 6950 4883 50  0000 C CNN
F 1 "74HC04" H 6950 4974 50  0000 C CNN
F 2 "" H 6950 5200 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 6950 5200 50  0001 C CNN
	5    6950 5200
	0    1    1    0   
$EndComp
$Comp
L 74xx:74HC04 U2
U 6 1 5F348C21
P 7500 5200
F 0 "U2" H 7500 4883 50  0000 C CNN
F 1 "74HC04" H 7500 4974 50  0000 C CNN
F 2 "" H 7500 5200 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 7500 5200 50  0001 C CNN
	6    7500 5200
	0    1    1    0   
$EndComp
NoConn ~ 6950 5500
NoConn ~ 7500 5500
$Comp
L power:+5V #PWR017
U 1 1 5F362747
P 6950 4400
F 0 "#PWR017" H 6950 4250 50  0001 C CNN
F 1 "+5V" H 6965 4573 50  0000 C CNN
F 2 "" H 6950 4400 50  0001 C CNN
F 3 "" H 6950 4400 50  0001 C CNN
	1    6950 4400
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR018
U 1 1 5F36313E
P 7500 4400
F 0 "#PWR018" H 7500 4250 50  0001 C CNN
F 1 "+5V" H 7515 4573 50  0000 C CNN
F 2 "" H 7500 4400 50  0001 C CNN
F 3 "" H 7500 4400 50  0001 C CNN
	1    7500 4400
	1    0    0    -1  
$EndComp
Wire Wire Line
	6950 4400 6950 4900
Wire Wire Line
	7500 4400 7500 4900
$Comp
L Connector:TestPoint TP1
U 1 1 5F35E250
P 4800 2450
F 0 "TP1" V 4754 2638 50  0000 L CNN
F 1 "TXDen_TP" V 4845 2638 50  0000 L CNN
F 2 "" H 5000 2450 50  0001 C CNN
F 3 "~" H 5000 2450 50  0001 C CNN
	1    4800 2450
	0    1    1    0   
$EndComp
Connection ~ 4800 2450
Wire Wire Line
	4800 2450 4800 2100
Connection ~ 5750 2100
Wire Wire Line
	4800 2100 5750 2100
Wire Notes Line
	6550 7450 6550 6200
Wire Notes Line
	6550 6200 9000 6200
Wire Notes Line
	800  3000 9000 3000
Wire Notes Line
	9000 3000 9000 6200
Wire Notes Line style dash_dot
	2950 2650 4800 2650
Text Notes 3200 2600 0    50   ~ 0
Connect, if TxDen-timer is not used.
NoConn ~ 2950 2650
NoConn ~ 4800 2650
$EndSCHEMATC
